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samples/src/test/java/demo/SigningAesTest.java
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samples/src/test/java/demo/SigningAesTest.java
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/*******************************************************************************
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* Copyright (C) 2025, Leo Galambos
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software must
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* display the following acknowledgement:
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* This product includes software developed by the Egothor project.
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*
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* 4. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************/
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package demo;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.security.GeneralSecurityException;
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import java.security.KeyPair;
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import java.security.SecureRandom;
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import java.security.Signature;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.crypto.SecretKey;
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import org.junit.jupiter.api.Test;
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import zeroecho.core.CryptoAlgorithm;
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import zeroecho.core.CryptoAlgorithms;
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import zeroecho.core.alg.aes.AesKeyGenSpec;
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import zeroecho.core.alg.rsa.RsaKeyGenSpec;
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import zeroecho.core.alg.rsa.RsaSigSpec;
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import zeroecho.core.tag.TagEngine;
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import zeroecho.core.tag.TagEngineBuilder;
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import zeroecho.core.util.Strings;
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import zeroecho.sdk.builders.TagTrailerDataContentBuilder;
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import zeroecho.sdk.builders.alg.AesDataContentBuilder;
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import zeroecho.sdk.builders.core.DataContentChainBuilder;
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import zeroecho.sdk.builders.core.PlainBytesBuilder;
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import zeroecho.sdk.content.api.DataContent;
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class SigningAesTest {
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private static final Logger LOG = Logger.getLogger(SigningAesTest.class.getName());
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SecretKey generateAesKey() throws GeneralSecurityException {
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// Locate the AES algorithm in the catalog
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CryptoAlgorithm aes = CryptoAlgorithms.require("AES");
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SecretKey key = aes
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// Retrieve the builder that works with AesKeyGenSpec - the specification for
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// AES key generation
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.symmetricKeyBuilder(AesKeyGenSpec.class)
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// Generate a secret key according to the AES256 specification
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.generateSecret(AesKeyGenSpec.aes256());
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// Log the generated key (truncated to short hex for readability)
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LOG.log(Level.INFO, "AES256 key generated: {0}", Strings.toShortHexString(key.getEncoded()));
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// or just: CryptoAlgorithms.generateSecret("AES", AesKeyGenSpec.aes256())
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return key;
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}
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KeyPair generateRsaKeys() throws GeneralSecurityException {
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KeyPair kp = CryptoAlgorithms.generateKeyPair("RSA", RsaKeyGenSpec.rsa4096());
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LOG.log(Level.INFO, "RSA key public={0} private={1}",
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new Object[] { Strings.toShortHexString(kp.getPublic().getEncoded()),
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Strings.toShortHexString(kp.getPrivate().getEncoded()) });
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return kp;
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}
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@Test
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void aesRoundStESdkLevelAPI() throws GeneralSecurityException, IOException {
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LOG.info("aesRoundSmarterSdkLevelAPI - Sign then Encrypt");
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// Sample message to encrypt
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byte[] msg = randomBytes(100);
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AesDataContentBuilder aesBuilder = AesDataContentBuilder.builder().generateKey(256).modeGcm(128).withHeader();
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// RSA-2048 keys (use registry for convenience)
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KeyPair rsa = generateRsaKeys();
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// Tag engines (SHA-256, saltLen=32)
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RsaSigSpec pss = RsaSigSpec.pss(RsaSigSpec.Hash.SHA256, 32);
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TagEngine<Signature> tagEnc = TagEngineBuilder.rsaSign(rsa.getPrivate(), pss).get();
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TagEngine<Signature> tagDec = TagEngineBuilder.rsaVerify(rsa.getPublic(), pss).get();
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// The builder stores generated IV and AAD inside the stream header
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DataContent dccb = DataContentChainBuilder.encrypt().add(PlainBytesBuilder.builder().bytes(msg))
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// sign the data
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.add(new TagTrailerDataContentBuilder<>(tagEnc).bufferSize(8192))
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// and then encrypt
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.add(aesBuilder).build();
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SecretKey key = aesBuilder.generatedKey();
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LOG.log(Level.INFO, "SDK-smart: AES256 key generated {0}", Strings.toShortHexString(key.getEncoded()));
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byte[] encrypted;
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try (InputStream encryptedStream = dccb.getStream()) {
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// Consume the encrypted data into memory
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encrypted = readAll(encryptedStream);
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}
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dccb = DataContentChainBuilder.decrypt().add(PlainBytesBuilder.builder().bytes(encrypted))
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// Use the same AES key for decryption; IV and AAD are restored from the header
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.add(AesDataContentBuilder.builder().importKeyRaw(key.getEncoded()).modeGcm(128).withHeader())
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// the decrypted stream must be verified
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.add(new TagTrailerDataContentBuilder<>(tagDec).bufferSize(8192).throwOnMismatch())
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// Build the pipeline
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.build();
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byte[] decrypted;
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try (InputStream decryptedStream = dccb.getStream()) {
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// Consume the decrypted data into memory
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decrypted = readAll(decryptedStream);
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}
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LOG.log(Level.INFO, "original message={0} after AES roundtrip={1}",
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new Object[] { Strings.toShortHexString(msg), Strings.toShortHexString(decrypted) });
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}
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@Test
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void aesRoundEtSSdkLevelAPI() throws GeneralSecurityException, IOException {
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LOG.info("aesRoundSmarterSdkLevelAPI - Encrypt then Sign");
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// Sample message to encrypt
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byte[] msg = randomBytes(100);
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AesDataContentBuilder aesBuilder = AesDataContentBuilder.builder().generateKey(256).modeGcm(128).withHeader();
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// RSA-2048 keys (use registry for convenience)
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KeyPair rsa = generateRsaKeys();
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// Tag engines (SHA-256, saltLen=32)
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RsaSigSpec pss = RsaSigSpec.pss(RsaSigSpec.Hash.SHA256, 32);
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TagEngine<Signature> tagEnc = TagEngineBuilder.rsaSign(rsa.getPrivate(), pss).get();
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TagEngine<Signature> tagDec = TagEngineBuilder.rsaVerify(rsa.getPublic(), pss).get();
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// The builder stores generated IV and AAD inside the stream header
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DataContent dccb = DataContentChainBuilder.encrypt().add(PlainBytesBuilder.builder().bytes(msg))
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// encrypt
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.add(aesBuilder)
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// and then sign
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.add(new TagTrailerDataContentBuilder<>(tagEnc).bufferSize(8192))
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//
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.build();
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SecretKey key = aesBuilder.generatedKey();
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LOG.log(Level.INFO, "SDK-smart: AES256 key generated {0}", Strings.toShortHexString(key.getEncoded()));
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byte[] encrypted;
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try (InputStream encryptedStream = dccb.getStream()) {
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// Consume the encrypted data into memory
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encrypted = readAll(encryptedStream);
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}
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dccb = DataContentChainBuilder.decrypt().add(PlainBytesBuilder.builder().bytes(encrypted))
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// the stream must be verified, but encryption still runs as data flows through
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.add(new TagTrailerDataContentBuilder<>(tagDec).bufferSize(8192).throwOnMismatch())
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// Use the same AES key for decryption; IV and AAD are restored from the header
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.add(AesDataContentBuilder.builder().importKeyRaw(key.getEncoded()).modeGcm(128).withHeader())
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// Build the pipeline
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.build();
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byte[] decrypted;
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try (InputStream decryptedStream = dccb.getStream()) {
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// Consume the decrypted data into memory
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decrypted = readAll(decryptedStream);
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}
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LOG.log(Level.INFO, "original message={0} after AES roundtrip={1}",
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new Object[] { Strings.toShortHexString(msg), Strings.toShortHexString(decrypted) });
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}
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// helpers
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private static byte[] randomBytes(int len) {
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byte[] data = new byte[len];
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new SecureRandom().nextBytes(data);
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return data;
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}
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private static byte[] readAll(InputStream in) throws IOException {
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try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
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in.transferTo(out);
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out.flush();
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return out.toByteArray();
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}
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}
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}
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